Just popping up a quick note.
I've updated the download script slightly to return a message if the ftp server is temporarily not accepting any more connections. The ftp server only accepts so many simultaneous connections at any given time, and some browsers weren't returning the ftp servers messages correctly, so have tried to bypass the browser and print a message to screen to say that the ftp server allocation is full and to try downloading later. It appeared to be causing a bit of confusion, so hopefully now it should be a tad more intuitive in use.